Some servers may have several applications, each running in their own allocated piece of RAM and SWAP.  It seems easy enough to use `top` to determine memory usage, but it wasn’t so obvious (to me) as to how to determine swap usage.  A nifty little command called smem to the rescue.

So what is smem?  It is a “Report memory usage with shared memory divided proportionally.”  This as defined by man smem.

Example:

yum install smem -y
smem -t -p

Source(s)